I am looking to pick a brain cell or two! 

I would like to get a 20mA ±12V DC supply without, if possible, having to build a complete mains PSU but utilising my existing ones.

My PreAmp box contains all the signal pcbs along with a couple of PSUs. Mains comes in and out, along with signals, no 'wall warts' are used. My current PSUs are a ±9V 200mA supply for the Analogue circuits and +5V supply for the Digital ones. There are a couple of 3.3V supplies generated on the PCBs, also for the digital circuits.

The ±9V supplies use 7809 and 7909 regulators and the +5V supply (until Graham's new beast becomes available!) use a OKI78 SR-5 switching regulator. 

I thought about changing the ±9V PSU to ±12V with an additional ±9V output but that seems rather inefficient as it would have to drop 3V at 200mA X 2, 1.2W of energy.

I believe it would be possible using a Charge Pump Circuit but I have not used or ever worked with one and I don't know if its output would be suitable for an audio analogue circuit.

Can anyone give me some guidance/suggestions?

Thanks